Knowledge that Transforms

This paper studies how municipal governments jointly manage spending, credit market borrowing, and a public employee pension system. I model governments as levered investors who must meet non-defaultable pension obligations and may value government spending more than citizens. I quantify the model using data on California cities, including a new record of fiscal emergencies, tax increases required to maintain essential city services. After the financial crisis depleted pension funds, cities engaged in excessive risk-taking: the fiscal emergency option encouraged gambling for resurrection that kept cities vulnerable to shocks well into the recovery. To correct this problem, a savings requirement works better than a restriction on risk-taking or a pension funding requirement. The policy experiments emphasize that effective policies need to target the combined pension and bond finances, as policies that only target one, such as a pension funding requirement, are undermined by endogenous changes to the other.

We experimentally study decentralized one-to-one matching markets with transfers. We vary the information available to participants, complete or incomplete, and the surplus structure, supermodular or submodular. Several insights emerge. First, while markets often culminate in efficient matchings, stability is more elusive, reflecting the difficulty of arranging attendant transfers. Second, incomplete information and submodularity present hurdles to efficiency and especially stability; their combination drastically diminishes stability's likelihood. Third, matchings form ``from the top down'' in complete-information supermodular markets, but exhibit many more and less-obviously ordered offers otherwise. Last, participants' market positions matter far more than their dynamic bargaining styles for outcomes.

We show that the emergence of new economic opportunities that draw women away from their traditional domestic roles has significantly influenced the adoption of religious veiling. We measure the prevalence of veiling among young women across Indonesia's districts for more than two decades by hand-coding around a quarter million photographs attached to Indonesia's public high school registers. To establish causality, we exploit exogenous variation generated by international demand for Indonesia's products, interacted with the gender and sectoral composition of local industries. Districts exposed to stronger positive economic shocks---and thus greater economic opportunities for women---exhibit higher rates of veiling adoption. Our findings suggest that veiling facilitates young women's participation in formal labor markets while safeguarding their personal and social image in society.

We estimate the impact of public pension incentives on labor supply far from the normal retirement age by exploiting Poland's switch from a Defined Benefit to a Notional Defined Contribution (NDC) scheme. This reform created a sharp cohort-based discontinuity in the link between current pension contributions and future benefits. Using this discontinuity and the universe of taxpayers, we estimate an employment elasticity with respect to the net return to work of 0.51 for men at ages 51-54. We estimate a lifecycle model to match these responses and discuss the broader implications of the reform. The shift to NDC reallocates work incentives over the lifecycle, strengthening incentives at younger ages, when labor supply is relatively inelastic, and weakening them at older ages, when labor supply is more elastic. This reallocation of work incentives tends to reduce aggregate lifecycle labor supply, which highlights the advantage of targeting pension incentives towards ages at which labor supply is most responsive.

Do workers from social groups with comparable productivity distributions obtain comparable lifetime earnings? We study how a small amount of early-career discrimination propagates over time when workers’ productivity is revealed through employment. In breakdown learning environments that primarily track on-the-job failures, such discrimination spirals into a substantial lifetime earnings gap for groups of comparable productivity, whereas in breakthrough learning environments that track successes, early-career discrimination can be self-corrected, so comparable groups obtain comparable lifetime earnings. This contrast persists in large labor markets and with flexible wages, inconclusive learning, and misspecified employer beliefs.

We study opinion dynamics in a social network consisting of two groups. Agents update their opinions by conforming to members of their own group while rejecting the views of the opposing group (affective polarization), and by listening to a media outlet that may provide biased information. We characterize the long-run opinions and identify when affective polarization and media bias lead to ideological polarization, persistent disagreement, or failures of learning. We also derive when information interventions or censorship improve the accuracy of average opinions and reduce disagreement, and when they backfire: better information helps only under specific media bias configurations and when directed to the agents we identify as most effective at propagating it through the network.

We study a parsimonious model of a competitive labor market in which firms privately screen workers to identify talent. The equilibrium exhibits dispersion in wages and productivity; when talent is scarce, firms with superior screening skills post higher wages, attract better applicants, and recruit more talented workers. High-wage firms impose a compositional externality on low-wage firms, leading to equilibrium inefficiency: Welfare would be higher if low-skilled firms posted high wages and selected first. We also provide a micro-foundation for firms heterogeneous screening skills. When talented workers are better at screening (e.g. via superior referrals), a dynamic version of the economy converges to a unique steady state in which differences in talent, profits and screening skills persist forever.

Consider a setting where N players, partitioned into K observable types, form a directed network. Agents’ preferences over the form of the network consist of an arbitrary network benefit function (e.g., agents may have preferences over their network centrality) and a private, or dyadic, component which is additively separable in own links. This latter component allows for unobserved heterogeneity in the costs of sending and receiving links across agents (respectively out- and in- degree heterogeneity) as well as homophily/heterophily across the K types of agents. In contrast, the network benefit function allows agents’ preferences over links to vary with the presence or absence of links elsewhere in the network (and hence with the link formation behavior of their peers). In the null model, which excludes the network benefit function, links form independently across dyads in the manner described by Charbonneau (2017) among others. Under the alternative, there is interdependence across linking decisions (i.e., strategic interaction). We show how to test the null with power optimized in specific directions. These alternative directions include many common models of strategic network formation (e.g., “connections” models, “structural hole” models etc.). Our random utility specification induces an exponential family structure under the null which we exploit to construct a similar test which exactly controls size (despite the the null being a composite one with many nuisance parameters). We further show how to construct locally best tests for specific alternatives without making any assumptions about equilibrium selection. To make our tests feasible, we introduce a new MCMC algorithm for simulating the null distributions of our test statistics.

This paper studies the unemployment of physical capital—defined as idle units searching to be traded—and its macroeconomic implications. I provide evidence documenting that capital unemployment is large, volatile, and increases during economic downturns. I construct a capital-accumulation model that explains these patterns, with trading frictions in capital markets, which give rise to equilibrium capital unemployment, and financial shocks, which lead to large fluctuations in trading probabilities and capital unemployment. Using the model, I show that trading frictions and capital unemployment matter for aggregate dynamics. First, unemployed capital affects aggregate investment dynamics: Downturns characterized by large increases in unemployed capital are followed by investment slumps, because the economy tends to recover by absorbing existing unemployed capital rather than by producing new capital goods. Second, capital unemployment constitutes a propagation mechanism from financial shocks to economic activity, which shows up at the aggregate level as measured total factor productivity.

We study monopolistic certification in markets where sellers possess partial private information about product quality. A certifier can provide information through two channels: screening sellers’ private information (soft information) and acquiring new quality data (hard information). We prove that any certification menu achieving less than maximal screening is Pareto dominated by one with full screening. Among Pareto-efficient menus, the certifier’s profit-maximising menu provides maximal soft information while restricting hard information provision. The two channels diverge because screening creates value the certifier can fully capture, whereas hard information amplifies costly information rents. Using power value functions, we derive comparative statics showing that information restrictions target low-quality sellers when information value is moderate, but high-quality sellers receive perfect quality revelation when information value is high.